Washington (CNN) - Chanting "We are the change," hundreds of anti-war protesters gathered across from the White House on Saturday, the seventh anniversary of the war in Iraq.

More than a dozen speakers, including politician Ralph Nader and anti-war activist Cindy Sheehan, addressed the crowd before the group marched through Washington. Protesters delivered symbolic coffins draped with international flags to the offices of Halliburton - a controversial energy services company once helmed by former Vice President Dick Cheney - and the White House.

Police arrested five people after they laid down by the coffins in front of the White House.

"Is the honeymoon over with that war criminal in the Oval Office?" yelled Sheehan during the rally before the march, to shouts of agreement from the crowd. "Why are we giving him a free pass when he didn't deserve it?"